Virtualized software-defined network

ABSTRACT

A method may include generating a set of instructions for a set of devices in software-defined network (SDN) to monitor a set of characteristics. The method may also include sending the set of instructions to the set of devices in the SDN via a control plane that is isolated from a packet forwarding path. The method may further include receiving monitor data via the control plane from at least one device of the set of devices in the SDN. The method may also include determining a change to a set of parameters of the SDN. The method may include generating a policy based on the change to the set of parameters of the SDN. The method may include sending the policy to the set of devices in the SDN.

CROSS REFERENCE TO RELATED APPLICATIONS

This application claims priority to U.S. Patent App. No. 62/539,491,filed Jul. 31, 2017, which is hereby incorporated by reference in itsentirety.

FIELD

The embodiments discussed in the present disclosure are related to avirtualized software-defined network.

BACKGROUND

The use of networks is a useful tool in allowing communication betweendistinct computing devices. Despite the proliferation of computers andnetworks over which computers communicate, there still remains variouslimitations to current network technologies.

The subject matter claimed in the present disclosure is not limited toembodiments that solve any disadvantages or that operate only inenvironments such as those described above. Rather, this background isonly provided to illustrate one example technology area where someembodiments described in the present disclosure may be practiced.

SUMMARY

One or more embodiments of the present disclosure may include a methodthat may include identifying a set of devices in a software-definednetwork (SDN). The method may include determining a set ofcharacteristics that the set of devices in the SDN are to monitor withinthe SDN. The method may include generating a set of instructions for theset of devices in the SDN to monitor the set of characteristics. Themethod may further include sending the set of instructions as a controlmessage to the set of devices in the SDN via a control plane that isisolated from a packet forwarding path. The method may also includereceiving monitor data via the control plane from at least one device ofthe set of devices in the SDN. The monitor data may be based on the atleast one device of the set of devices in the SDN monitoring of the setof characteristics substantially in real-time. The method may includedetermining a change to a set of parameters of the SDN. The method mayfurther include generating a policy, based on the change to the set ofparameters of the SDN. The method may also include sending the policy tothe set of devices in the SDN. An execution of the policy at one or moreof the set of devices in the SDN adjusts the monitor data to moreclosely match a template.

One or more embodiments of the present disclosure may additionallyinclude systems and/or non-transitory computer readable media forfacilitating the performance of such methods.

The object and advantages of the embodiments will be realized andachieved at least by the elements, features, and combinationsparticularly pointed out in the claims.

It is to be understood that both the foregoing general description andthe following detailed description are merely examples and explanatoryand are not restrictive of the invention, as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

Example embodiments will be described and explained with additionalspecificity and detail through the use of the accompanying drawings inwhich:

FIG. 1 illustrates an example system of network components implementinga software-defined network (SDN);

FIG. 2 illustrates another example system implementing a SDN;

FIG. 3 illustrates an additional example system as part of a SDN;

FIG. 4 illustrates another example system implementing a SDN;

FIG. 5 illustrates a flowchart of an example method to monitor a set ofcharacteristics in a SDN;

FIG. 6 illustrates a flowchart of an example method to generate a datamodel based on monitor data of a SDN;

FIG. 7 illustrates a flowchart of an example method to generate a policybased on a data model and monitor data in a SDN; and

FIG. 8 illustrates an example computing system.

DESCRIPTION OF EMBODIMENTS

Some embodiments of the present disclosure relate to improvements to theoperation of software-defined networks (SDN) and routing of networktraffic. In a SDN, a network control plane may be functionally separatedfrom physical topology and a data plane, unlike conventional networking.For example, the SDN may include one or more virtualized components,such as a router that is run on a virtual machine, a hypervisor, or acloud-based server.

Over the control plane, a control device may monitor the SDN and pathcharacteristics of the data plane tunnels between devices (e.g.,routers). The control device may use this information to generate datamodels and generate policies. The policies may be sent to devices in thenetwork to steer data traffic onto various links. Because the SDNextends a single virtual fabric over all available transports, paths ortunnels that satisfy the performance service level agreements (SLAs) foran application can be chosen for forwarding. Choice of transport can beinfluenced by cost, quality of service, service availability in specificgeographies, circuit delivery times, operational processes,organizational policies, and regulations, such as in-country regulationsand policies. Application-aware routing results in improved userexperience and better bandwidth utilization.

One or more embodiments of the present disclosure may include solutionsto technology-based problems associated with software-definednetworking. Embodiments of the present disclosure may provideimprovements to computer networks and to the operation of computersthemselves. For example, using one or more embodiments of the presentdisclosure, network traffic may flow with increased performancepreserving valuable network resources such as bandwidth and providingincreased response times. Additionally, the amount of traffic flowingthrough the internal network domain may be reduced, providing superiorperformance for the internal network domain. As another example, pathavailability may be guaranteed for a rerouted path, which may improvereliability for important applications. As an additional example, theperformance of applications utilizing third party resources may beimproved because a path with an optimal or improved performance may beused for the application, allowing for increased response times,increased data throughput per unit time, among others.

Embodiments of the present disclosure are explained with reference tothe accompanying drawings.

FIG. 1 illustrates an example system 100 of network componentsimplementing a software-defined network (SDN), in accordance with one ormore embodiments of the present disclosure. The SDN may include any typeof network or network topology. For example, the SDN may include asoftware-defined wide area network (SD-WAN), software-defined local areanetwork (LAN), software-defined metropolitan area network (MAN), or anyother type of network. The system 100 may include an internal networkdomain 105 and one or more external network domains. The system 100 mayinclude one or more edge network devices 110 (such as the edge networkdevices 110 a-110 d), a control device 120, a communication network 130,and external network devices 140 and 141 (such as the external networkdevices 140 a-140 d and 141 a-141 d).

For ease and clarity in explanation, some examples of the presentdisclosure are described with respect to a WAN where the network ismanaged at least partially by software rather than controlled byhardware. As such, the SDN may support multiple types of connections orcommunication links, such as the Internet, MultiProtocol Label Switching(MPLS) connections, and/or cellular connections (such as Long TermEvolution (LTE), LTE Advanced, Worldwide Interoperability for MicrowaveAccess (WiMAX), Evolved High Speed Packet Access (HSPA+), and/orothers). Additionally, the SDN may support load balancing or loadsharing between the various connections. Further, because of thedistributed nature of some networks, the SDN may support virtual privatenetworks (VPNs), firewalls, and other security services. In an SD-WAN,for example, a control plane may be functionally separated from thephysical topology. In some embodiments, the SDN may separate the controlplane of the network (to be managed via software) from a data plane ofthe network (operating on the hardware of the network). As used herein,the term control plane may refer to communications and connections usedin the control and administration of a network itself, rather than thetransmission of data through the network, which may occur at the dataplane. The control plane may be used in conjunction with the collectionof data from various components in the SDN. As used herein, the termdata plane may refer to communications and connections used in thetransmission and reception of data through the network. For example, thecontrol plane may include administrative traffic directed to a networkdevice within a network, while the data plane may include traffic thatpasses through network devices within the network. The control plane maybe used to exchange data between the control device 120 and variouscomponents in the SDN separately than traffic on the data plane. In atleast one embodiment, data on the control plane may be isolated fromtraffic on the data plane. The isolation may be physical isolation(e.g., in different physical hardware and wires), or logical (e.g.,isolated in the internal network domain 105 via software). Isolation ofthe data on the control plane from traffic on the data plane may provideincreased security for one or both of the data on the control plane andthe traffic on the data plane. Data on the control plane may beexchanged between the control device 120 and various components in theSDN at or near real-time.

In some embodiments, the control device 120 may be configured to managethe control plane of an internal network domain 105 by directing one ormore aspects of the operation of the edge network devices 110. Thecontrol device 120 may direct data collection activities at variouscomponents of the SDN. For example, the control device 120 may directone or more of the edge network devices 110 to monitor variouscharacteristics of the SDN, such as performance, SLA, security, etc.Monitored data include data associated with the monitoredcharacteristics. The monitored data may include bandwidth data, usagedata, carrier data, geography data, user data, application data, sitedata, loss, latency, jitter, cost data, network events, syslogs, amongother data. The control device 120 may use one or more control messagesto direct the data collection activities at the various components ofthe SDN. For example, the control device 120 may generate a set ofinstructions for a set of devices in the SDN to monitor a set ofcharacteristics. The control device 120 may send the set of instructionsas a control message to the set of devices in the SDN via the controlplane.

According to the set of instructions in the control message, the set ofdevices in the SDN may collect the monitor data. The devices in thesystem may send the monitor data securely over a data-bus in real-timeto the control device 120. As an example, with QoS monitoring ofcommunication links, the edge network devices 110 may provide for one ormore QoS metrics that may be monitored for any communication link, suchas jitter, bandwidth, error rate, bit rate, throughput, and/or others.The various components of the SDN may send monitored data to the controldevice 120 via the control plane.

The control device 120 may generate data models and/or policies based atleast in part on the monitor data collected from the various componentsof the SDN. The control device 120 may receive an input signal (e.g.,input from a system administrator, a software-based trigger) to generatea data model in view of a set of input parameters. The input signal mayinclude the set of input parameters. For example, for QoS monitoring ofcommunication links, the set of input parameters may include various QoScharacteristics and/or the QoS metrics (e.g., jitter, bandwidth, errorrate, bit rate, throughput, and/or others). The control device 120 maygenerate the data model based on the set of input parameters and themonitor data. For example, the control device 120 may apply machinelearning algorithms to the monitored data in order to satisfy use-casesof network planning (e.g., forecasting), network operations (e.g., SLApolicy recommendation, carrier selection), what-if analysis, and networksecurity (anomaly detection).

For network planning and forecasting, the control device 120 may, forexample, use the monitor data and input parameters (e.g., bandwidth,apps, sites, alarm level) to provide a forecast of future bandwidth forapps and/or sites based on the monitor data (e.g., past usage) and thealarm level. For forecasting, for example, the control device 120 mayuse one or more regression algorithms, such as regression algorithmsdirected to a generalized linear model with extreme gradient boost.

For network planning, the control device 120 may, for example, use themonitor data and various input parameters (e.g., carrier details, time)for carrier selection. For example, the control device 120 may provide adata model around one or more carriers (e.g., Comcast, AT&T, Verizon) toillustrate carrier performance to customers. The customers may use thedata model in determining whether to provision new sites in a particulargeographical area. The data model may provide guidance on whichcarrier(s) are the top performing carriers in that particulargeographical area.

For network operations, the control device 120 may, for example, use themonitor data for correlation and root cause analysis. As an example, thesystem 100 may include many (e.g., hundreds, thousands, hundreds ofthousands, millions, etc.) of events coming from a SDN overlay network.In order to determine a real root cause, the control device 120 maydefine categories of correlated events and then use network domainknowledge (e.g., the monitor data) to establish a cause and effectrelationship between these correlated events. The control device 120 maythen narrow the list to a set of potential root causes. In someembodiments, the control device 120 may use an algorithm based oncorrelation with pearson correlation coefficient.

Additionally, for network operations, the control device 120 may, forexample, use the monitor data and input parameters to generate SLApolicy recommendations. In at least some embodiments, the control device120 may estimate a cost function of making a change to the system 100.In at least some embodiments, the control device 120 may generate anapproximation of a sensitivity score that may represent how sensitive aprocess may be to changes in loss, latency, jitter relative to otherprograms. The control device 120 may group classes of devices where arelative importance of loss, latency, and jitter within the devices in aparticular class may be fixed or relatively constant. The sensitivityscore may be generated using various functions. For example, the controldevice 120 may classify applications such as video applications into afirst class and web application into a second class. The videoapplications may have a first sensitivity score that may be representedby the function of x+y+ẑ2. The web applications may have a secondsensitivity score that may be represented by a second function, 2x+y+logz. The control device 120 may then use an algorithm (e.g., a randomforest of regression trees, a neural net) and the monitor data (e.g.,historical SLA data) to generate an estimate of how triggering an SLApolicy may affect the SLA characteristics of the system 100. The controldevice 120 may use the output of the random forest algorithm and theestimated cost function as input to a linear regression function tocompute a data model—an expected cost of different SLAs. In at leastsome embodiments, the function applied may include a convex function.The control device 120 may use the expected cost of different SLAsagainst the monitor data to generate a policy that can be executed on anedge network device 110.

The control device 120 may also be used to generate various data modelsfor “what-if” analyses. The “what if” analysis may be used to predicteffects on the system 100 in response to various changes that may bemade to the system 100. For example, a “what-if” data model may be usedto predict how bandwidth needs may change in various scenarios, such aswhen new users are added to existing sites, new applications are addedto existing sites, new sites are up with users and/or applications, etc.The “what-if” data model may also be used to provide an analysis on howSLA characteristics may change when some or all traffic is moved from afirst tunnel to a second tunnel. Another aspect to moving applicationsfrom one tunnel to another includes network cost analysis, which mayinclude a cost versus performance assessment. For example, a performancelevel of an applications on a broadband tunnel may be lesser than aperformance of the application on an MPLS tunnel, but the cost savingsof using the broadband tunnel may outweigh the increased performancethat may be realized on the MPLS tunnel.

The control device 120 may also be used to for network security, such asanomaly detection. The control device 120 may periodically analyze themonitor data for irregularities and/or anomalies. For example, thecontrol device 120 may use anomaly detection of applications at eachsite in the network for enforcing security related use-cases or toenforce improved planning. In at least some embodiments, the controldevice 120 may use standard deviations and weighted moving averages. Forexample, a detection of the monitor data that is, for example, 2-3standard deviations away from a moving average(baseline) may indicate ananomaly for normal distributions. The control device 120 may also useK-means for clustering. Any other suitable algorithm may be used. Otherexample anomalies that may be detected include: anomaly detection forbandwidth usage on a per application/site basis, anomaly detection fornetwork events, and anomaly detection for network performance metrics ofloss/latency/jitter on a per application/site basis. These differentuses for anomaly detection may assist the control device 120 and/or anetwork administrator to focus on relevant data points. These anomalousdata points may also form a basis for various actions that may be takenwithin the system 100. In addition to being useful for securitypurposes, anomaly detection may also be used for network operations,such as optimizing network bandwidth, application performance, andnetwork troubleshooting, among others.

The control device 120 may cause an action pertaining to the SDN in viewof the data model. For example, based on the monitor data and/oranalysis of the monitor data and data model, the control device 120 maygenerate a policy to affect various changes in the SDN. An execution ofthe policy at one or more of the set of devices in the SDN may adjustthe monitor data to more closely match a template. The template mayinclude a predetermined set of characteristics and/or outputs of theSDN.

The control device 120 may distribute the policies to one or more of theedge network devices 110. A policy may include a rule or set of rulesbearing on the handling of network traffic, such as routing, priority,media, etc. As an example, with SLAs, the policy may include edge athreshold level for one or more QoS metrics, such as bandwidth,availability, jitter, and/or others. In these and other embodiments, apolicy on a given edge network device 110 may be configured to adjust orotherwise modify one or more properties of how the given edge networkdevice 110 handles or routes traffic to better comply with one or moreSLAs. For example, the traffic flow for one application may be sent viaa particular communication link so that the traffic flow may comply witha corresponding SLA.

The internal network domain 105 may operate as a secured and controlleddomain with specific functionality and/or protocols. In someembodiments, the edge network devices 110 may operate based on one ormore policies created and/or propagated by the control device 120. Inthese and other embodiments, the edge network devices 110 may route datatraffic within the internal network domain 105 based on the policiescreated and/or propagated by the control device 120.

In some embodiments, the control device 120 may form a control planeconnection with each of the edge network devices 110. The control planeconnection may facilitate the exchange of data (e.g., various analyticsdata obtained by the edge network devices 110) between the edge networkdevices 110 and the control device 120 for management and control of theinternal network domain 105. The control plane connection may beseparate from a data transfer plane. For example, the control planeconnection may operate via a tunnel through the communication network130, such as a Datagram Transport Layer Security (DTLS) tunnel. In someembodiments, data transmitted over the control plane connection mayfacilitate the control device 120 determining topology and othercharacteristics of the communication network 130. For example, thecontrol device 120 may communicate with the edge network devices 110 todetermine what physical connections exist between and among the edgenetwork devices 110 in the communication network 130. Additionally oralternatively, data transmitted over the control plane connection mayfacilitate the control device 120 determining available, optimal ordesired paths across the communication network 130 between and among theedge network devices 110. Additionally or alternatively, datatransmitted over the control plane connection may facilitate the edgenetwork devices 110 determining available, optimal or desired pathsacross the communication network 130 between and among the edge networkdevices 110. Additionally or alternatively, the control device 120 maycommunicate information (e.g., control messages, sets of instructions,monitor data, policies) to and from the edge network devices 110 overthe control plane connection. In these and other embodiments, thecontrol plane connection may include a permanent connection between thecontrol device 120 and the edge network devices 110 such that if theconnection between the control device 120 and a given edge networkdevice 110 is broken, the edge network device 110 may be unable orotherwise disallowed from communicating over the internal network domain105.

In some embodiments, the control device 120 may maintain a central routetable that stores route information within the internal network domain105. For example, the control device 120 may communicate with variousedge network devices 110 to determine the physical and/or logicalconnections available to the edge network devices 110 through thecommunication network 130. In some embodiments, the edge network devices110 may include one or more physical and/or logical connections to eachother. In these and other embodiments, the control device 120 maygenerate and/or update one or more policies in conjunction with themonitor data and/or the central route table to help the edge networkdevices 110 to determine data traffic routes through the internalnetwork domain 105. For example, the control device 120 may providepolicies and other configuration preferences related to traffic flows tothe edge network devices 110 rather than being involved with everyindividual flow through the internal network domain 105.

In these and other embodiments, the edge network devices 110 may nothave stored the topology and/or route paths of the entire system 100.Each of the edge network devices 110 may not need to query each otherindividually to determine reachability. Instead, the control device 120may provide such information to the edge network devices 110. In theseand other embodiments, the edge network devices 110 may route trafficthrough a most direct route, a most cost effective route, a mostreliable route, or through some other route based on one or more otherpolicies received from of the control device 120, characteristics of thetraffic, characteristics of the route path, a source edge network device110, and a destination (e.g., edge network device 110).

In some embodiments, the one or more policies may include guidanceregarding determining next-hop and route path instructions. For example,a particular policy may instruct a particular edge network device 110where to route the traffic next for a particular category, class, orgroup of traffic flows, rather than providing a complete end-to-endroute for the traffic. For example, the edge network device 110 a mayreceive data from an external network device 140 a directed to anaddress of the external network device 141 c. The edge network device110 a may have stored a first policy that the network device 110 a mayuse to determine the route path for the data, including that a“next-hop” for network traffic destined for the address of the externalnetwork device 141 c is to be routed to the edge network device 110 d.

In some embodiments, the control device 120 may generate policies basedat least in part on monitor data collected within the system and/oranalytics performed on the monitor data to cause certain network trafficflows within the internal network domain 105 to be routed over certaintypes of connections or communication links (e.g., LTE, Internet, MPLS)and/or through certain edge network devices 110. In some embodiments, alink classification may indicate a type of communication link. The edgenetwork devices 110 may use a policy to determine an action. Forexample, for a given set of data, the policy may indicate that a firstrouting path may be selected based on a configuration preference andbased on a type or classification of a communication link. Based on apolicy, the edge network devices 110 may also determine an action (e.g.,determine a route path) for all packets from a particular source, allpackets that originated from a particular computer laptop, a type oftraffic (e.g., voice), etc. In another example, a policy have aconfiguration preference that may indicate that all flows with IPaddresses in the range 100.1/16 may be categorized as voice flows. Whenthe edge network devices 110 is connected to three differentcommunication links (e.g., an Internet link an MPLS link, a cellularlink). The configuration preference may indicate that voice traffic isto be routed over the Internet link. Thus, the edge network devices 110may route all flows with IP addresses in the range 100.1/16 over theInternet link. Other examples of configuration preferences may includecosts (e.g., monetary, time, route, hops, transport health (such asloss, latency, and/or jitter), bandwidth, path geography, source (e.g.,device, geography, user), destination (e.g., device, geography, user),applications (e.g., business, social), user groups (e.g., finance on afirst subnet IP, HR on a second subnet IP, engineering on a third subnetIP, among others. Any type of data or information may be used as aconfiguration preference. In an example, the edge network device 110 mayidentify metadata associated with the traffic, such as a header. Theheader may include a DSCP value in the header to indicate a predefinedrouting path. The edge network device 110 may also make routingdecisions based on a specific application (which may sometimes bereferred to as a layer7 header or http header). For example, the edgenetwork device 110 may route OFFICE365 traffic on a first path andSALESFORCE traffic on a second path.

In some embodiments, the control device 120 may receive one or more keysfrom the edge network devices 110 used in communication of data over thedata plane. For example, one or more data packets may use one or morekeys for security purposes in transmitting data from one edge networkdevice 110 to another edge network device 110. In these and otherembodiments, the control device 120 may reflect the received keys to oneor more other edge network devices 110 that may be in the traffic flowbased on the central route table and/or the policies implemented by thecontrol device 120. In these and other embodiments, a given edge networkdevice 110 may generate symmetrical keys to facilitate securecommunication between edge network devices. In these and otherembodiments, a pair of symmetrical keys may be generated by the givenedge network device 110, with one remaining with the given edge networkdevice 110 and the other provided to the control device 120 such thatthe control device 120 may distribute the other symmetrical key to otheredge network devices that communicate with the given edge network device110. In such a way, each edge network device that is to communicate withthe given edge network device 110 based on the policies of the controldevice 120 may receive the symmetrical key.

In some embodiments, traffic within the internal network domain 105 maybe encrypted, such as with two-way authentication using AdvancedEncryption Standard (AES) with a 256-bit length key over one or moreDatagram Transport Layer Security (DTLS) and/or Transport Layer Security(TLS) connections between edge network devices 110.

In some embodiments, the control device 120 may store authenticationinformation for one or more (or all) of the edge network devices 110within the internal network domain 105. In these and other embodiments,a device may be prevented from communicating within the internal networkdomain 105 unless the device has authentication information that matchesor otherwise corresponds to the stored authentication information of thecontrol device 120. In some embodiments, the authentication informationmay be used when the edge network devices 110 first come on line toestablish the control plane connection, and any device without a controlplane connection with the control device 120 may be prevented fromcommunicating within the internal network domain 105.

The edge network devices 110 may operate at a boundary of the internalnetwork domain 105. The edge network devices 110 may include one or morephysical and/or logical connections that may operate within the internalnetwork domain 105. Such connections may be illustrated as part of thecommunication network 130. Additionally or alternatively, the edgenetwork devices 110 may include one or more physical and/or logicalconnections operating outside of the internal network domain 105. Forexample, the edge network devices 110 may be connected to the externalnetwork device(s) 140 and/or 141.

In some embodiments, the edge network devices 110 may operate to routetraffic from associated external network devices 140 and 141 into theinternal network domain 105. Additionally or alternatively, the edgenetwork devices 110 may operate to route traffic from the internalnetwork domain 105 to the associated external network devices 140 and141. In some embodiments, the edge network devices 110 may communicatewith associated external network devices 140 and 141 using typicalcommunication protocols, such as Open Shortest Path First (OSPF), BorderGateway Protocol (BGP), Virtual Router Redundancy Protocol (VRRP),Bi-directional Forwarding Detection (BFD), among others. Additionally oralternatively, the edge network devices 110 may support other networkfunctionalities such as differentiated services code point (DSCP)tagging or type of service (TOS) tagging, Quality of Service (QoS)monitoring, Service Level Agreements (SLA), Internet Protocol (IP)forwarding, Internet Protocol Security (IPsec), Access Control Lists(ACL), among others.

For example, with DSCP or TOS tagging, the edge network devices 110 maybe configured to insert a DSCP or TOS tag into a packet header. Such aDSCP or TOS tag may identify one (or a preferences for one)communication link of multiple communication links on which to sendcertain types of network traffic. Based on the DSCP or TOS tag, the edgenetwork devices 110 may route the network traffic via one or more typesof communication link.

As another example, with IP forwarding, the edge network devices 110 mayinclude one or more policies to route packets via a particular type ofcommunication link in an 1P network. For example, such a policy may takeinto account factors such as packet size, services specified by aheader, characteristics of potential links to other routers in thenetwork, and/or others. Using such factors, the edge network devices 110may forward packets based on a selected algorithm, such as a shortestpath.

As an additional example, with IPsec, the edge network devices 110 mayuse IPsec to authenticate and/or encrypt network traffic. For example, agiven edge network device 110 may authenticate one or more computingdevices to communicate with the given edge network device 110 and/orencrypt one or more packets communicated between the computing deviceand the given edge network device 110.

As another example, with ACLs, the edge network devices 110 may includea set of rules indicative of one or more addresses, hosts, and/ornetworks that may be permitted to use a given port or a particularcommunication link. In these and other embodiments, the edge networkdevices 110 may include ACLs that are applicable to inbound traffic,outbound traffic, or both.

In some embodiments, the edge network devices 110 may locally maintainone or more route tables. In some embodiments, the edge network devices110 may adjust or modify the route tables based on one or more policiessent from the control device 120. For example, one or more entries maybe removed, discarded, or otherwise not added to the route tables by theedge network devices 110 based on the one or more policies. In someembodiments, the edge network devices 110 may include logic to update,modify, and/or generate the route tables based on policies from thecontrol device 120 and/or from traffic handled by the edge networkdevices 110. The one or more route tables may be automatically populatedby the edge network devices 110 based on direct interface routes, staticroutes, and/or dynamic routes learned using one or more networkprotocols such as BGP and/or OSPF. In some embodiments, routingdecisions for data outside of the internal network domain 105 may beperformed by a particular edge network device 110 without specificdirection, input, or control from the control device 120. For example,the particular edge network device 110 may compute a routing decisionbased on the one or more policies that the particular edge networkdevice 110 has received from the control device 120.

In some embodiments, one or more of the edge network devices 110 and/orthe control device 120 may be implemented as one or more virtualmachines operating on one or more physical computing devices.Additionally or alternatively, the edge network devices 110 and/or thecontrol device 120 may each include an individual stand-alone computingdevice.

Modifications, additions, or omissions may be made to FIG. 1 withoutdeparting from the scope of the present disclosure. For example, whileillustrated as including four edge network devices 110 and one controldevice 120, the system 100 may include any number of edge networkdevices 110 and control devices 120, such as thousands or tens ofthousands of edge network devices 110 and more than five control devices120. As another example, as illustrated as a single communicationnetwork 130, the communication network 130 may include multiple types ofcommunication connections.

FIG. 2 illustrates another example system 200 of network componentsimplementing a SDN, in accordance with one or more embodiments of thepresent disclosure. The system 200 may include one or more edge networkdevices 210 (such as edge network devices 210 a-210 o), one or morecontrol devices 220 (such as control devices 220 a, 220 b, and 220 c),and one or more communication networks 230 (such as communicationnetworks 230 a, 230 b, and 230 c). The edge network devices 210 may besimilar or comparable to the edge network devices 110 of FIG. 1, thecontrol devices 220 may be similar or comparable to the control device120 of FIG. 1, and the communication networks 230 may be similar orcomparable to the communication network 130 of FIG. 1. The system 200may be a similar or comparable system to the system 100 of FIG. 1,although expanded to include additional network components andadditional external network domains.

The system 200 may include an internal network domain 205 in and betweenthe edge network devices 210, in a similar or comparable manner to thatdescribed with respect to the system 100 of FIG. 1. The system 200additionally may include multiple external network domains. For example,a data center 240 may represent a first external network domain, acampus 250 may represent a second external network domain, a branch 260may represent a third external network domain, and a remote site 270 mayrepresent a fourth external network domain. In these and otherembodiments, each external network domain may include one or more edgenetwork devices 210 acting as a bridge between the internal networkdomain 205 and the given external network domain. Additionally oralternatively, one or more of the external network domains mayfunctionally operate as being accessible from the other external networkdomains as though in a single network by being communicatively coupledthrough the internal network domain 205.

In some embodiments, the system 200 may include one or more externalresources 280 (such as the external resources 280 a-280 c). The externalresources 280 may be operated by the same entity or organization thatoperates the internal network domain 205, or may be operated by adifferent entity. In these and other embodiments, the system 200 mayinclude an edge network device 210 that may be associated with aparticular external resource 280. For example, the system 200 mayinclude an edge network device 210 located within a regional co-locationfacility. A regional co-location facility may include a location withdirected or guaranteed access to the Internet or other communicationprotocols at a given physical location. In some embodiments, a regionalco-location facility may include a prioritized or improved connection toone or more of the external resources 280. In some embodiments, theregional co-location facility may be at a designated geographicallocation that may be physically proximate one or more of the externalnetwork domains. For example, the data center 240 may be located in NewYork, and the branch 260 may be located in Dallas Tex., and the edgenetwork device 210 n may be in a regional co-location facility inHouston, Tex.

The external resources 280 may include any computing service availablefor consumption by the system 200. For example, the external resources280 may include a cloud-based service such as a software subscription orsoftware as a service (SaaS) (such as Microsoft Office 365®, Azure®,Google Apps®, Workforce®, Amazon Web Services®, WorkDay®, DocuSign®,GoToMeeting®, WebEx®, QuickBooks®, and/or others), media services (suchas YouTube®, NetFlix®, Pandora®, Spotify®, and/or others), and/orothers. In these and other embodiments, the external resources 280 mayinclude a third party network to facilitate access to the externalresource 280 with one or more access points at various geographicallocations. For example, a SaaS may include an access server in Austin,Tex.; Palo Alto, Calif.; and New York, N.Y. for accessing the thirdparty network.

In some embodiments, the system 200 may be geographically distributed.For example, the data center 240 may be located in St. Paul, Minn.; thecampus 250 may be located in Des Moines, Iowa; there may be branches 260in Seattle, Wash.; Los Angeles, Calif.; Atlanta, Ga.; and Orlando, Fla.;and there may be remote sites 270 in London, England; Berlin, Germany;and Seoul, Korea. In these and other embodiments, the system 200 may usethe communication networks 230 and the internal network domain 205 tofacilitate communication between all of these distributed physicallocations as a single network.

In some embodiments, one or more of the external network domains may useone or more applications with resources in the data center 240, such asMicrosoft Exchange®, SharePoint®, Oracle e-Business Suite®, and/orothers. For example, a workstation operating at the campus 250 mayoperate Microsoft Exchange®. The operation of the application mayinclude a data flow that goes from the workstation to the edge networkdevice 210 e in the external network domain of the campus 250. The dataflow may go from the edge network device 210 e to one of the edgenetwork devices 210 b, 210 c, and/or 210 d associated with the datacenter 240 through the internal network domain 205. The one of the edgenetwork devices 210 b, 210 c, and/or 210 d may route the traffic to theMicrosoft Exchange® server in the external network domain of the datacenter 240. Additionally or alternatively, the operation of theapplication may include a data flow in the reverse order of data flowingfrom the Microsoft Exchange® server to the workstation.

In some embodiments, the system 200 may include a network managementdevice 290 that may communicate with the control devices 220 over amanagement network 232. The network management device 290 may providemanagement and control of one or more devices associated with theinternal network domain 205, including the edge network devices 210, thecontrol devices 220, and/or others. For example, the network managementdevice 290 may provide a graphical user interface (GUI) that provides anetwork administrator with access to control or observe operation of theinternal network domain 205. In some embodiments, the networkadministrator may input policies via the network management device 290that may be communicated to the control devices 220 for implementationvia the edge network devices 210. In some embodiments, the networkmanagement device 290 may provide a GUI dashboard with a visual and/ortextual description of one or more properties of the internal networkdomain 205, such as a number and/or status and/or health of edge networkdevices 210, a number and/or status of control devices 220, a number ofand/or last time of reboot, transport health (such as loss, latency,and/or jitter), a number of sites that are operating or not operating,application consumption of network resources, application routing,and/or others.

In some embodiments, the network management device 290 may be configuredto recognize approved edge network devices 210 and/or control device220. For example, the network management device 290 may maintain a listof serial numbers, MAC addresses, or other uniquely identifyinginformation for the edge network devices 210 and/or the control devices220. In these and other embodiments, communication in the internalnetwork domain 205 may be restricted to edge network devices 210 and/orcontrol devices 220 with identifying information on the list maintainedby the network management device 290.

In some embodiments, the network management device 290 may be configuredto generate and/or store configurations of one or more edge networkdevices 210 and/or control devices 220. For example, a networkadministrator may use the network management device 290 to configure aparticular edge network device 210 and may store that configuration as atemplate that may be applied to future edge network devices.Additionally or alternatively, a template for the edge network devices210 may be provided by a third party and applied to a new edge networkdevice 210. In these and other embodiments, a template for the controldevices 220 may be generated, stored, and/or applied to a new controldevice 220. Additionally or alternatively, such a template may be usedto automatically configure a newly deployed edge network device 210. Forexample, the newly deployed edge network device 210 may be broughtonline and connected to a corresponding control device 220. Thecorresponding control device 220 may verify the serial number of theedge network device 210 with the network management device 290, and mayobtain a template from the network management device 290 for the edgenetwork device 210. The control device 220 may send the template to theedge network device 210 to be automatically installed to configure theedge network device 210 according to the template.

In at least some embodiments, the network management device 290 may beconfigured to manage data collection activities at various components ofthe SDN. For example, the network management device 290 may direct oneor more of the edge network devices 110 to monitor variouscharacteristics of the SDN, such as performance, SLA, security, etc. ina system with multiple control devices 220.

The network management device 290 may use one or more control messagesto direct the data collection activities at the various components ofthe SDN. For example, the network management device 290 may generate aset of instructions for a set of devices in the SDN to monitor a set ofcharacteristics. The network management device 290 may send the set ofinstructions as a control message to the set of devices in the SDN viathe control plane. In at least some embodiments, the network managementdevice 290 sends the control message to the control devices 220 and thecontrol devices 220 may distribute the control message to devices thatare connect to the respective control device 220.

Following the set of instructions in the control message, the set ofdevices in the SDN may collect the monitor data. The devices in thesystem may send the monitor data securely over a data-bus (e.g., thecontrol plane) in real-time to the network management device 290, suchas directly to the network management device 290 or indirectly, such asvia the control devices 220. As an example, with QoS monitoring ofcommunication links, the edge network devices 110 may provide for one ormore QoS metrics that may be monitored for any communication link, suchas jitter, bandwidth, error rate, bit rate, throughput, and/or others.The various components of the SDN may send monitored data to the networkmanagement device 290 via the control plane.

The network management device 290 may generate data models and/orpolicies based at least in part on the monitor data collected from thevarious components of the SDN. The network management device 290 mayreceive an input signal (e.g., input from a system administrator, asoftware-based trigger) to generate a data model in view of a set ofinput parameters. The network management device 290 may generate thedata model based on the set of input parameters and the monitor data.For example, the network management device 290 may apply machinelearning algorithms to the monitored data in order to satisfy use-casesof network planning (e.g., forecasting), network operations (e.g., SLApolicy recommendation, carrier selection), what-if analysis, and networksecurity (anomaly detection). Based on the monitor data and/or analysisof the monitor data and data model, the network management device 290may generate a policy to affect various changes in the SDN. The networkmanagement device 290 may distribute the policies to one or more of theedge network devices 110.

In at least some embodiments, the control devices 220 may generate andcommunicate control messages and/or policies independently of thenetwork management device 290 and the other control devices 220, such asis described in conjunction with FIG. 1.

In some embodiments, the network management device 290 may beimplemented as a physical device or a virtualized machine. In these andother embodiments, the network management device 290 may be physicallylocated proximate a centralized location, such as within the data center240 or at the campus 250.

Modifications, additions, or omissions may be made to FIG. 2 withoutdeparting from the scope of the present disclosure. For example, whileillustrated as including a certain number of edge network devices 210and external network domains, the system 200 may include any number ofedge network devices 210 and external network domains.

FIG. 3 illustrates an additional example system 300, in accordance withone or more embodiments of the present disclosure. FIG. 3 illustrates anedge network device 310 a that may include multiple potentialcommunication links for communicating across an internal network domain305 to another edge network device 310 b. For example, the edge networkdevice 310 a may communicate across the internal network domain 305using the Internet 360, an MPLS network 370, and/or an LTE network 380.The edge network devices 310 a and 310 b may be similar or comparable tothe edge network device 110 of FIG. 1 and/or the edge network devices210 a-210 o of FIG. 2. The system 300 may additionally include anexternal local device 350 that may be communicatively coupled to theedge network device 310 a across an external network domain.

In some embodiments, the edge network device 310 a may include anInternet connection 320, an MPLS connection 330, and an LTE connection340. As illustrated by the ellipses below the LTE connection 340, anynumber of additional or other potential connections may also beincluded. In these and other embodiments, the edge network device 310 amay include multiple circuits for connecting to the one or morepotential communication links. For example, the edge network device 310a may include a circuit A 322 and a circuit B 324 for the Internetconnection 320, a circuit A 332 and a circuit B 334 for the MPLSconnection 330, and a circuit A 342 and a circuit B 344 for the LTEconnection 340. In these and other embodiments, the edge network device310 a may be configured to route traffic along one or more of thecircuits, based on one or more policies stored by the edge networkdevice 310 a.

In at least some embodiments, the control plane may be implemented onone or more of the circuits 322, 324, 332, 334, 342, 344. In an example,the control plane may be implemented on MPLS circuit A 332 and, toachieve isolation of the control plane from the data plane, the dataplane maybe implemented on any of the other circuits 324, 334, 342, 344.

In some embodiments, the edge network device 310 a may be configured tomonitor one or more properties of the various connections. For example,the edge network device 310 a may monitor the jitter, latency, loss,and/or bandwidth of the various communication links from the edgenetwork device 310 a to the edge network device 310 b. In these andother embodiments, the edge network device 310 a may also monitor and/orstore security properties of the various communication links. Forexample, links 362 and 364 over the Internet 360 may be considered at afirst level of security, and links 372 and 374 over the MPLS network 370may be considered at a second level of security higher than the firstlevel of security.

In some embodiments, the edge network device 310 a may route traffic forone or more applications to specific circuits based on one or morepolicies and/or based on one or more properties of the variousconnections. For example, a video application may be particularlysusceptible to jitter. The edge network device 310 a may determine thatthe video traffic may be travelling across the link 382 with a jitter of10 ms, and that the link 362 may have a jitter of 4 ms. The edge networkdevice 310 a may shift the traffic for the video application to the link362 rather than the link 382 because of the lower jitter. In someembodiments, shifting from the link 382 to the link 362 may be based ona jitter-based SLA. As another example, the edge network device 310 amay receive a data flow for a security-sensitive application (such as anaccounting application) and may have a policy that data for thatapplication is to be routed along one of the MPLS links 372 and/or 374,even if other traffic may be routed along the Internet link 362. As anadditional example, the edge network device 310 a may include an SLAthat a given application have a bandwidth of 10 MB/s available to theapplication. The edge network device 310 a may make the link 362 overthe Internet 360 available to the application, but the link 362 mayprovide 5 MB/s of bandwidth. The edge network device 310 a may alsoprovide the links 382 and 384 to the application such that the overallcombined bandwidth of the links 362, 382, and 384 exceed the bandwidthagreement of the SLA. As yet another example, the edge network device310 a may route traffic for a given application via a particular type ofcommunication link. In at least one embodiment, the edge network device310 a may prohibit traffic for a given application along a particulartype of communication link. For example, traffic associated with asocial network or video application may be routed over the Internetconnections 362, 364 and prohibited from being routing over MPLSconnections 372, 374. In these and other embodiments, the edge networkdevice 310 a may be configured to perform such routing based oninitially receiving a data flow, during an on-going data flow (e.g., infast path), based on a triggering event of the data flow, and/or othersor combinations thereof. Additionally or alternatively, such routing maycombine multiple links of multiple types of connections for a singleflow in routing traffic flows.

In some embodiments, the edge network device 310 a may be configured toroute traffic to the various links based on the source of the traffic.For example, one or more policies may indicate that traffic from onecorporate department of a business is routed along the MPLS connection330, while traffic for another corporate department may be routed alongany link.

In some embodiments, the edge network device 310 a may be implemented asa computing system, such as the computing system 600 illustrated in FIG.6.

Modifications, additions, or omissions may be made to FIG. 3 withoutdeparting from the scope of the present disclosure. For example, whileillustrated as including a certain number of edge network devices 310,the system 300 may include any number of edge network devices 310. Asanother example, while illustrated as including three communicationnetworks (the Internet 360, the MPLS-based network 370, and the LTEnetwork 380) any number of communication networks may be used.

FIG. 4 illustrates another example system 400 implementing a SDN, inaccordance with one or more embodiments of the present disclosure. Thesystem 400 may include one or more edge network devices 410 (such as theedge network devices 410 a-410 f), which may be similar or comparable tothe edge network devices 110 of FIG. 1, 210 of FIG. 2, and/or 310 ofFIG. 3. The system 400 may also include one or more control devices 420,which may be similar or comparable to the control device 120 of FIG. 1,and/or 220 of FIG. 2. The system 400 may additionally include one ormore communication networks 430 and/or 432 (such as the communicationnetworks 432 a-432 c), which may be similar or comparable to thecommunication network 130 of FIG. 1, 230 of FIG. 2, and/or thecombination of any of the Internet 360, the MPLS network 370, and theLTE network 380 of FIG. 3. The system may additionally include a datacenter 440, which may be similar or comparable to the data center 240 ofFIG. 2. The system may also include one or more third party resources480 (such as the third party resources 480 a-480 c), which may besimilar or comparable to the third party resources 280 a-c of FIG. 2.For the purposes of discussing FIG. 4, the third party resources 480a-480 c may serve the same third party resource and may representdistinct servers for accessing the third party resource. For example,the third party resource 480 a may include a server for accessing acloud based service in Seattle, Wash., the third party resource 480 bmay include a server for accessing the cloud based service in LosAngeles, Calif., and the third party resource 480 c may include a serverfor accessing the cloud based service in New York, N.Y.

In some embodiments, the edge network device 410 a may determine whichpath a traffic flow may take based on a policy. For example, the edgenetwork device 410 a may identify metadata associated with the trafficflow and determine, based on the policy and metadata, a configurationpreference in the policy for the data to use routing paths with a firstlink classification. The edge network device 410 a may select a firstrouting path based on the configuration preference in the policy andbased on the first routing path including the first communication linkassociated with the first link classification. The edge network device410 a may transmit the data along the first routing path via the firstcommunication link. In at least one embodiment, there may be multiplepaths to a particular destination via different edge network deviceconnections to the same underlying transport (e.g., Internet or MPLS).Alternatively or additionally, there may be multiple paths via the sametwo sets of edge network devices connected via different underlyingtransport. For example a first underlying transport may include Internetand a second underlying transport may include MPLS.

In some embodiments, each of the edge network devices 410 may assess theperformance of paths between a given edge network device 410 and theother edge network devices 410. For example, the edge network device 410a may monitor the performance of the paths 461, 462, 465, and 466; andthe edge network device 410 b may monitor the performance of the paths463, 464, 467, and 468. In these and other embodiments, the edge networkdevices 410 may monitor one or more of jitter, latency, loss, and/orbandwidth of the various paths. For example, one or more test packetsmay be communicated among or between the edge network devices 410 andcharacteristics of the travel time and/or integrity of the test packetsmay be used to determine the performance metrics of the paths.Additionally or alternatively, one or more of the performance metricsmay be combined into a single score reflecting the performance of thepaths within the internal network domain 405.

In some embodiments, one or more of the edge network devices 410 maycommunicate the determined performance metrics with one or morecomponents of the system 400. For example, the edge network devices 410may communicate the performance metrics to the control device 420, andthe control device 420 may distribute the performance metrics to one ormore of the edge network devices 410. As another example, the edgenetwork devices 410 may communicate the performance metrics to one ormore other edge network devices 410 (e.g., the edge network device 410 bmay communicate the performance metrics for the paths 463, 464, 467, and468 to the edge network device 410 a). The control device 420 maydetermine and/or updated a policy based at least in part on theperformance metrics.

In some embodiments, one or more of the edge network devices 410 mayassess the performance of paths between a given edge network device 410and one or more connections to the third party resource 480. Forexample, the edge network devices 410 e and/or 410 f may monitor theperformance of the path 491, the edge network device 410 c may monitorthe performance of the path 492, and the edge network device 410 d maymonitor the performance of the path 493. In these and other embodiments,the edge network devices 410 may monitor one or more of jitter, latency,loss, and/or bandwidth of the various paths. For example, one or morerequests may be communicated from the edge network devices 410 to thethird party resource 480 and characteristics of the travel time and/orintegrity of the response to the request may be used to determine theperformance metrics of the paths. For example, the edge network devices410 may use httping, or some other similar tool. In some embodiments,one or more of the performance metrics may be combined into a singlescore reflecting the performance of the path outside of the internalnetwork domain 405.

In some embodiments, the edge network devices 410 may maintain a table,database, or other storage structure of the scores of the performancemetrics of the various paths in the system 400. In these and otherembodiments, the edge network devices 410 may use the stored scores whendetermining routing paths for data. For example, the edge network device410 a may store a table with a single score for each of the paths in thesystem 400.

In some embodiments, the edge network device 410 a may compare scores ofthe potential paths to the third party resource 480 to determine whichpath the rerouted traffic may flow along. For example, the edge networkdevice 410 a may compare the combined scores of the paths 461+491,462+491, 465+493, 466+492, 467+493, and 468+492. In these and otherembodiments, the edge network device 410 may determine which scorerepresents the best performance for the traffic.

In some embodiments, the internal network domain 405 may includemultiple possible paths between two edge network devices 410. Forexample, the path 465 between the edge network device 410 a and the edgenetwork device 410 d may represent an MPLS connection, and a secondconnection (not illustrated) between the edge network device 410 a andthe edge network device 410 d may include an Internet or cellularconnection. In these and other embodiments, each path, includingmultiple paths between the same two edge network devices 410, may eachinclude a unique score generated by the control device 420. Using suchunique scores, the control device 420 may determine which path to beused and generate and distribute a policy accordingly.

In some embodiments, if multiple paths have the same score representingthe best score for routing data, based on the policy the edge networkdevice 410 a may route the traffic along the multiple paths with thebest score. For example, a first set of the data may be routed along thefirst path and a second set of the data may be routed along a secondpath with the same score as the first path. In determining whether toroute along the first path or the second path, the edge network device410 a may hash the header of a packet within the flow and, depending onthe output of the hash, may route the flow to one of the first path orthe second path. While described as the path or paths with the bestscore, the path with a score relative to a threshold may also beselected.

In some embodiments, the policy may designate a primary path and abackup path for the rerouted path. The edge network device 410 a maymonitor the performance of the primary path of the rerouted path and,based on changes in the score for the primary path and the policy, theedge network device 410 a may reroute the traffic to the backup path ora different path. In some embodiments, the score may be monitored and/orrerouted relative to an SLA. In at least one embodiment, the primarypath may be determined based on the configuration preference.

Modifications, additions, or omissions may be made to FIG. 4 withoutdeparting from the scope of the present disclosure. For example, whileillustrated as including a certain number of edge network devices 410,the system 400 may include any number of edge network devices 410. Asanother example, while illustrated as including a single path betweenany two edge network devices 410, any number of paths over any number ofmediums may be included between edge network devices 410.

FIGS. 5-7 illustrates a flowchart of an example method 500 ofmonitoring, analyzing and taking action with respect to a SDN, inaccordance with one or more embodiments of the present disclosure. Themethod may be performed by processing logic that may include hardware(circuitry, dedicated logic, etc.), software (such as is run on ageneral purpose computer system or a dedicated machine), or acombination of both, which processing logic may be included in the anyof the network devices (e.g., the control devices 120, 220, 420 of FIGS.1, 2 and 4, and/or the network management device 290 of FIG. 2), oranother computer system or device. However, another system, orcombination of systems, may be used to perform the methods. Forsimplicity of explanation, methods described herein are depicted anddescribed as a series of acts. However, acts in accordance with thisdisclosure may occur in various orders and/or concurrently, and withother acts not presented and described herein. Further, not allillustrated acts may be used to implement the methods in accordance withthe disclosed subject matter. In addition, those skilled in the art willunderstand and appreciate that the methods may alternatively berepresented as a series of interrelated states via a state diagram orevents. Additionally, the methods disclosed in this specification arecapable of being stored on an article of manufacture, such as anon-transitory computer-readable medium, to facilitate transporting andtransferring such methods to computing devices. The term article ofmanufacture, as used herein, is intended to encompass a computer programaccessible from any computer-readable device or storage media. Althoughillustrated as discrete blocks, various blocks may be divided intoadditional blocks, combined into fewer blocks, or eliminated, dependingon the desired implementation.

FIG. 5 illustrates a flowchart of an example method 500 to monitor a setof characteristics in a SDN. The method 500 may begin at block 505,where the processing logic may identify a set of devices in asoftware-defined network (SDN). At least one device of the set ofdevices in the SDN may include a virtual device. The set of devicesinclude any type or location of devices, such as one or more edgenetwork devices 110 (such as the edge network devices 110 a-110 d), acontrol device 120, a communication network 130, and external networkdevices 140 and 141 (such as the external network devices 140 a-140 dand 141 a-141 d), described in more detail in conjunction with FIG. 1 orany other device or connection described in conjunction with FIGS. 2-4.

At block 510, the processing logic may determine a set ofcharacteristics that the set of devices in the SDN are to monitor withinthe SDN. The processing logic may determine the set of characteristicsbased on input received from a system administrator, and/or in responseto machine-based input (e.g., in response to machine learnedcharacteristics to monitor). In at least some embodiments, determiningthe set of characteristics that the set of devices in the SDN are tomonitor within the SDN includes determining a first set ofcharacteristics for a first device type and determining a second set ofcharacteristics for a second device type. For example, the first set ofcharacteristics may be related to an edge device and the second set ofcharacteristics may be related to a circuit. In at least someembodiments, determining the set of characteristics that the set ofdevices in the SDN are to monitor within the SDN includes determining tomonitor at least one of: an anomaly, performance data, location data,payload data, carrier data, data related to an application, and networkcharacteristics. In at least some embodiments, determining the set ofcharacteristics that the set of devices in the SDN are to monitor withinthe SDN includes selecting a subset of devices of the set of devices inthe SDN. For example, the processing logic may select devices of acertain type, or a subset of devices within a given type.

At block 515, the processing logic may generate a set of instructionsfor the set of devices in the SDN to monitor the set of characteristics.In at least some embodiments, generating the set of instructions for theset of devices in the SDN to monitor the set of characteristics mayinclude generating the set of instructions for a subset of devices.

At block 520, the processing logic may send the set of instructions as acontrol message to the set of devices in the SDN via a control planethat is isolated from a packet forwarding path. In at least someembodiments, sending the set of instructions as the control message tothe set of devices in the SDN via the control plane that is isolatedfrom the packet forwarding path may include sending a first set ofcharacteristics to one or more devices of a first device type andsending a second set of characteristics to one or more devices of asecond device type. In at least some embodiments, sending the set ofinstructions as the control message to the set of devices in the SDN viathe control plane that is isolated from the packet forwarding path mayinclude sending the set of instructions as the control message to asubset of devices via the control plane that is isolated from the packetforwarding path.

At block 525, the processing logic may receive monitor data via thecontrol plane from at least one device of the set of devices in the SDN.The monitor data may be based on the at least one device of the set ofdevices in the SDN monitoring of the set of characteristicssubstantially in real-time. In at least some embodiments, the monitordata received via the control plane is encrypted. The processing logicmay decrypt such encrypted monitor data.

At block 530, the processing logic may determine a change to a set ofparameters of the SDN. In at least some embodiments, determining thechange to the set of parameters of the SDN may include comparing themonitor data with a template and determining at least one differencebetween the monitor data and the template. The change to the set ofparameters of the SDN is determined to adjust the monitor data to moreclosely match the template. The template may include a predetermined setof characteristics that set of devices in the SDN are to have. Thetemplate may be defined by a system administrator, an SLA, etc.

At block 535, the processing logic may generate a policy, based on thechange to the set of parameters of the SDN. An execution of the policyat one or more of the set of devices in the SDN may adjust the monitordata to more closely match the template

At block 540, the processing logic may send the policy to the set ofdevices in the SDN. In at least some embodiments, the processing logicmay send the policy to the set of devices in the SDN via the controlplane.

One skilled in the art will appreciate that, for these processes,operations, and methods, the functions and/or operations performed maybe implemented in differing order. Further, the outlined functions andoperations are only provided as examples, and some of the functions andoperations may be optional, combined into fewer functions andoperations, or expanded into additional functions and operations withoutdetracting from the essence of the disclosed embodiments.

FIG. 6 illustrates a flowchart of an example method 600 to generate adata model based on monitor data of a SDN. The method 600 may begin atblock 605, where the processing logic may generate a set of instructionsfor a set of devices in a software-defined network (SDN) to monitor aset of characteristics, as further described in conjunction with FIG. 5.

At block 610, the processing logic may send the set of instructions as acontrol message to the set of devices in the SDN via a control planethat is isolated from a packet forwarding path, as further described inconjunction with FIG. 5.

At block 615, the processing logic may receive monitor data via thecontrol plane from at least one device of the set of devices in the SDN,the monitor data being based on the at least one device of the set ofdevices in the SDN monitoring of the set of characteristicssubstantially in real-time.

At block 620, the processing logic may receive an input signal togenerate a data model in view of a set of input parameters. The inputsignal may be received from a system administrator via a user interface,or may be generated based on machine-learned activities.

At block 625, the processing logic may generate the data model based onthe set of input parameters and the monitor data. In at least someembodiments, the data model may pertain to a network planning for theSDN based on the set of input parameters and the monitor data. In atleast some embodiments, the data model may pertain to one or morecarriers of the packet forwarding path in a particular geographicalregion. In at least some embodiments, the data model may pertain networksecurity in the SDN. In at least some embodiments, generating the datamodel based on the set of input parameters and the monitor data mayinclude determining, based on the set of input parameters, at least onenetwork security characteristic in view of the monitor data. In at leastsome embodiments, the data model may pertain to a what-if analysis forat least one of: adding a new user to an existing site in the SDN,adding a new application to an existing site in the SDN, adding a newsite to the SDN.

At block 630, the processing logic may cause an action pertaining to theSDN in view of the data model. In at least some embodiments, causing theaction pertaining to the SDN in view of the data model may includegenerating a policy based on the data model and sending the policy tothe set of devices in the SDN via the control plane. In at least someembodiments, the policy may include a dynamic service level agreement(SLA) policy. The data model may include a model for how SLAcharacteristics may be affected in response to a change to the SDN. Forexample, the data model may include a traffic model for when traffic maybe moved from one tunnel to another tunnel. An execution of the policyat one or more of the set of devices in the SDN adjusts the monitor datato more closely match a template, such as the template further describedin conjunction with FIG. 5. In at least some embodiments, generating thepolicy based on the data model may include determining a change to a setof operation parameters of the SDN by comparing the monitor data with abaseline set of activity data and determining at least one differencebetween the monitor data and the baseline set of activity data. Thechange to the set of parameters of the SDN is determined by theprocessing logic to adjust the monitor data to more closely match thetemplate. In at least some embodiments, causing the action pertaining tothe SDN in view of the data model may include selecting one carrier ofone or more carriers to handle the packet forwarding path. In at leastsome embodiments, causing the action pertaining to the SDN in view ofthe data model may include generating a parameter recommendation for thepolicy based on the data model. In at least some embodiments, theparameter recommendation for the policy is generated based on at leastone network characteristic. The at least one network characteristic mayinclude at least one of a loss, a latency, and a jitter.

One skilled in the art will appreciate that, for these processes,operations, and methods, the functions and/or operations performed maybe implemented in differing order. Further, the outlined functions andoperations are only provided as examples, and some of the functions andoperations may be optional, combined into fewer functions andoperations, or expanded into additional functions and operations withoutdetracting from the essence of the disclosed embodiments.

FIG. 7 illustrates a flowchart of an example method 700 to generate apolicy based on a data model and monitor data in a SDN. The method 700may begin at block 705, where the processing logic may generate a set ofinstructions for a set of devices in a software-defined network (SDN) tomonitor a set of characteristics.

At block 710, the processing logic may send the set of instructions as acontrol message to the set of devices in the SDN via a control planethat is isolated from a packet forwarding path.

At block 715, the processing logic may receive monitor data via thecontrol plane from at least one device of the set of devices in the SDN,the monitor data being based on the at least one device of the set ofdevices in the SDN monitoring of the set of characteristicssubstantially in real-time.

At block 720, the processing logic may generate a data model based on aset of SDN parameters and the monitor data. In at least someembodiments, generating the data model based on the set of SDNparameters and the monitor data includes generating an approximation ofa sensitivity score for a process. The sensitivity score for the processis based on how sensitive the process may be to changes in loss, latencyand jitter. The processing logic may also generate an estimate on howthe change may affect the set of devices in the SDN. In at least someembodiments, generating the policy, based on the change for at least onedevice of the set of devices in the SDN may include generating thepolicy to reduce the effect on the set of devices in the SDN below athreshold level. In at least some embodiments, generating the estimateon how the change may affect the set of devices in the SDN may includeusing a random forest algorithm and historical data to estimate on howthe change may affect the set of devices in the SDN. In at least someembodiments, generating the data model based on the set of SDNparameters and the monitor data further may include generating the datamodel based on an output of the random forest algorithm and an estimatedcost function to determine expected cost of different SLA.

At block 725, the processing logic may determine a change for at leastone device of the set of devices in the SDN based on the data model. Inat least some embodiments, the change for at least one device of the setof devices in the SDN includes a change to at least one data route path.

At block 730, the processing logic may generate a policy, based on thechange for at least one device of the set of devices in the SDN.

At block 735, the processing logic may send the policy via the controlplane to the set of devices in the SDN, wherein an execution of thepolicy at one or more of the set of devices in the SDN adjusts themonitor data to more closely match a template.

At block 740, the processing logic may update the policy based onadditional monitor data. The processing logic may receive additionalmonitor data after sending the policy via the control plane to the setof devices in the SDN. The processing logic may update based on theadditional monitor data. In at least some embodiments, updating thepolicy based on the additional monitor data may include generating asecond data model based on the set of SDN parameters, the monitor data,and the additional monitor data. Updating the policy based on theadditional monitor data may further include determining a second changefor at least one device of the set of devices in the SDN based on thesecond data model. Updating the policy based on the additional monitordata may also include updating the policy based on the second change forat least one device of the set of devices in the SDN.

One skilled in the art will appreciate that, for these processes,operations, and methods, the functions and/or operations performed maybe implemented in differing order. Further, the outlined functions andoperations are only provided as examples, and some of the functions andoperations may be optional, combined into fewer functions andoperations, or expanded into additional functions and operations withoutdetracting from the essence of the disclosed embodiments.

FIG. 8 illustrates an example computing system 800, according to atleast one embodiment described in the present disclosure. The system 800may include any suitable system, apparatus, or device configured to testsoftware. The computing system 800 may include a processor 810, a memory820, a data storage 830, and a communication unit 840, which all may becommunicatively coupled. In some embodiments, any of the network devices(e.g., the edge network devices 110, 210, 310, or 410 of FIGS. 1-4),control devices (e.g., the control devices 120, 220, 320, or 420 ofFIGS. 1-4), local computing devices (e.g., the local computing device450 of FIG. 4, network management devices (e.g., the network managementdevice 290 of FIG. 2) or other computing devices of the presentdisclosure may be implemented as the computing system 800. Additionallyor alternatively, one or more of the network devices, control devices,local computing devices or other computing devices may be implemented asvirtualized machines operating on a physical computing system such asthe computing system 800.

Generally, the processor 810 may include any suitable special-purpose orgeneral-purpose computer, computing entity, or processing deviceincluding various computer hardware or software modules and may beconfigured to execute instructions stored on any applicablecomputer-readable storage media. For example, the processor 810 mayinclude a microprocessor, a microcontroller, a digital signal processor(DSP), an application-specific integrated circuit (ASIC), aField-Programmable Gate Array (FPGA), or any other digital or analogcircuitry configured to interpret and/or to execute program instructionsand/or to process data.

Although illustrated as a single processor in FIG. 8, it is understoodthat the processor 810 may include any number of processors distributedacross any number of network or physical locations that are configuredto perform individually or collectively any number of operationsdescribed in the present disclosure. In some embodiments, the processor810 may interpret and/or execute program instructions and/or processdata stored in the memory 820, the data storage 830, or the memory 820and the data storage 830. In some embodiments, the processor 810 mayfetch program instructions from the data storage 830 and load theprogram instructions into the memory 820.

After the program instructions are loaded into the memory 820, theprocessor 810 may execute the program instructions, such as instructionsto perform the methods 500, 600, and/or 700 FIGS. 5-7, respectively. Forexample, the processor 810 may determine that a traffic flow isassociated with a rerouting application and reroute the traffic flowalong the path with the best performance score. As another example, theprocessor 810 may rewrite DNS queries and/or DNS replies. As anadditional example, the processor 810 may route flows such that an NATexit point associated with a rerouted path may be used. As an additionalexample, the processor 810 may determine which path from multiple pathsis the best path and reroute traffic accordingly.

The memory 820 and the data storage 830 may include computer-readablestorage media or one or more computer-readable storage mediums forcarrying or having computer-executable instructions or data structuresstored thereon. Such computer-readable storage media may be anyavailable media that may be accessed by a general-purpose orspecial-purpose computer, such as the processor 810. In someembodiments, the computing system 800 may or may not include either ofthe memory 820 and the data storage 830.

By way of example, and not limitation, such computer-readable storagemedia may include non-transitory computer-readable storage mediaincluding Random Access Memory (RAM), Read-Only Memory (ROM),Electrically Erasable Programmable Read-Only Memory (EEPROM), CompactDisc Read-Only Memory (CD-ROM) or other optical disk storage, magneticdisk storage or other magnetic storage devices, flash memory devices(e.g., solid state memory devices), or any other storage medium whichmay be used to carry or store desired program code in the form ofcomputer-executable instructions or data structures and which may beaccessed by a general-purpose or special-purpose computer. Combinationsof the above may also be included within the scope of computer-readablestorage media. Computer-executable instructions may include, forexample, instructions and data configured to cause the processor 810 toperform a certain operation or group of operations.

The communication unit 840 may include any component, device, system, orcombination thereof that is configured to transmit or receiveinformation over a network, such as an MPLS connection, the Internet, acellular network (e.g., an LTE network), etc. In some embodiments, thecommunication unit 840 may communicate with other devices at otherlocations, the same location, or even other components within the samesystem. For example, the communication unit 840 may include a modem, anetwork card (wireless or wired), an optical communication device, aninfrared communication device, a wireless communication device (such asan antenna), a chipset (such as a Bluetooth device, an 802.6 device(e.g., Metropolitan Area Network (MAN)), a WiFi device, a WiMax device,cellular communication facilities, or others), and/or the like, or anycombinations thereof. The communication unit 840 may permit data to beexchanged with a network and/or any other devices or systems describedin the present disclosure. For example, the communication unit 840 mayallow the system 800 to communicate with other systems, such as networkdevices, control devices, and/or other networks.

Modifications, additions, or omissions may be made to the system 800without departing from the scope of the present disclosure. For example,the data storage 830 may be multiple different storage mediums locatedin multiple locations and accessed by the processor 810 through anetwork.

As indicated above, the embodiments described in the present disclosuremay include the use of a special purpose or general purpose computer(e.g., the processor 810 of FIG. 8) including various computer hardwareor software modules, as discussed in greater detail below. Further, asindicated above, embodiments described in the present disclosure may beimplemented using computer-readable media (e.g., the memory 820 or datastorage 830 of FIG. 8) for carrying or having computer-executableinstructions or data structures stored thereon.

As used in the present disclosure, the terms “module” or “component” mayrefer to specific hardware implementations configured to perform theactions of the module or component and/or software objects or softwareroutines that may be stored on and/or executed by general purposehardware (e.g., computer-readable media, processing devices, or someother hardware) of the computing system. In some embodiments, thedifferent components, modules, engines, and services described in thepresent disclosure may be implemented as objects or processes thatexecute on the computing system (e.g., as separate threads). While someof the systems and methods described in the present disclosure aregenerally described as being implemented in software (stored on and/orexecuted by general purpose hardware), specific hardware implementationsor a combination of software and specific hardware implementations arealso possible and contemplated. In this description, a “computingentity” may be any computing system as previously defined in the presentdisclosure, or any module or combination of modulates running on acomputing system.

In accordance with common practice, the various features illustrated inthe drawings may not be drawn to scale. The illustrations presented inthe present disclosure are not meant to be actual views of anyparticular apparatus (e.g., device, system, etc.) or method, but aremerely idealized representations that are employed to describe variousembodiments of the disclosure. Accordingly, the dimensions of thevarious features may be arbitrarily expanded or reduced for clarity. Inaddition, some of the drawings may be simplified for clarity. Thus, thedrawings may not depict all of the components of a given apparatus(e.g., device) or all operations of a particular method.

Terms used in the present disclosure and especially in the appendedclaims (e.g., bodies of the appended claims) are generally intended as“open” terms (e.g., the term “including” should be interpreted as“including, but not limited to,” the term “having” should be interpretedas “having at least,” the term “includes” should be interpreted as“includes, but is not limited to,” among others).

Additionally, if a specific number of an introduced claim recitation isintended, such an intent will be explicitly recited in the claim, and inthe absence of such recitation no such intent is present. For example,as an aid to understanding, the following appended claims may containusage of the introductory phrases “at least one” and “one or more” tointroduce claim recitations.

In addition, even if a specific number of an introduced claim recitationis explicitly recited, those skilled in the art will recognize that suchrecitation should be interpreted to mean at least the recited number(e.g., the bare recitation of “two recitations,” without othermodifiers, means at least two recitations, or two or more recitations).Furthermore, in those instances where a convention analogous to “atleast one of A, B, and C, etc.” or “one or more of A, B, and C, etc.” isused, in general such a construction is intended to include A alone, Balone, C alone, A and B together, A and C together, B and C together, orA, B, and C together, etc.

Further, any disjunctive word or phrase presenting two or morealternative terms, whether in the description, claims, or drawings,should be understood to contemplate the possibilities of including oneof the terms, either of the terms, or both terms. For example, thephrase “A or B” should be understood to include the possibilities of “A”or “B” or “A and B.”

However, the use of such phrases should not be construed to imply thatthe introduction of a claim recitation by the indefinite articles “a” or“an” limits any particular claim containing such introduced claimrecitation to embodiments containing only one such recitation, even whenthe same claim includes the introductory phrases “one or more” or “atleast one” and indefinite articles such as “a” or “an” (e.g., “a” and/or“an” should be interpreted to mean “at least one” or “one or more”); thesame holds true for the use of definite articles used to introduce claimrecitations.

Additionally, the use of the terms “first,” “second,” “third,” etc., arenot necessarily used herein to connote a specific order or number ofelements. Generally, the terms “first,” “second,” “third,” etc., areused to distinguish between different elements as generic identifiers.Absence a showing that the terms “first,” “second,” “third,” etc.,connote a specific order, these terms should not be understood toconnote a specific order. Furthermore, absence a showing that the terms“first,” “second,” “third,” etc., connote a specific number of elements,these terms should not be understood to connote a specific number ofelements. For example, a first widget may be described as having a firstside and a second widget may be described as having a second side. Theuse of the term “second side” with respect to the second widget may beto distinguish such side of the second widget from the “first side” ofthe first widget and not to connote that the second widget has twosides.

All examples and conditional language recited in the present disclosureare intended for pedagogical objects to aid the reader in understandingthe invention and the concepts contributed by the inventor to furtheringthe art, and are to be construed as being without limitation to suchspecifically recited examples and conditions. Although embodiments ofthe present disclosure have been described in detail, it should beunderstood that the various changes, substitutions, and alterationscould be made hereto without departing from the spirit and scope of thepresent disclosure.

What is claimed is:
 1. A method, comprising: identifying a set ofdevices in a software-defined network (SDN); determining a set ofcharacteristics that the set of devices in the SDN are to monitor withinthe SDN; generating a set of instructions for the set of devices in theSDN to monitor the set of characteristics; sending the set ofinstructions as a control message to the set of devices in the SDN via acontrol plane that is isolated from a packet forwarding path; receivingmonitor data via the control plane from at least one device of the setof devices in the SDN, the monitor data being based on the at least onedevice of the set of devices in the SDN monitoring of the set ofcharacteristics substantially in real-time; determining a change to aset of parameters of the SDN; generating a policy, based on the changeto the set of parameters of the SDN; and sending the policy to the setof devices in the SDN, wherein an execution of the policy at one or moreof the set of devices in the SDN adjusts the monitor data to moreclosely match a template.
 2. The method of claim 1, wherein at least onedevice of the set of devices in the SDN is a virtual device.
 3. Themethod of claim 1, wherein determining the set of characteristics thatthe set of devices in the SDN are to monitor within the SDN comprises:determining a first set of characteristics for a first device type,wherein sending the set of instructions as the control message to theset of devices in the SDN via the control plane that is isolated fromthe packet forwarding path comprises sending the first set ofcharacteristics to one or more devices of the first device type; anddetermining a second set of characteristics for a second device type,wherein sending the set of instructions as the control message to theset of devices in the SDN via the control plane that is isolated fromthe packet forwarding path comprises sending the second set ofcharacteristics to one or more devices of the second device type.
 4. Themethod of claim 1, wherein determining the set of characteristics thatthe set of devices in the SDN are to monitor within the SDN comprisesdetermining to monitor at least one of: an anomaly, performance data,location data, payload data, carrier data, data related to anapplication, and network characteristics.
 5. The method of claim 1,wherein determining the change to the set of parameters of the SDNcomprises comparing the monitor data with the template and determiningat least one difference between the monitor data and the template,wherein the change to the set of parameters of the SDN is determined toadjust the monitor data to more closely match the template.
 6. Themethod of claim 1, wherein the monitor data received via the controlplane is encrypted, the method further comprising decrypting the monitordata.
 7. The method of claim 1, wherein determining the set ofcharacteristics that the set of devices in the SDN are to monitor withinthe SDN comprises selecting a subset of devices of the set of devices inthe SDN.
 8. The method of claim 7, wherein generating the set ofinstructions for the set of devices in the SDN to monitor the set ofcharacteristics comprises generating the set of instructions for thesubset of devices, wherein sending the set of instructions as thecontrol message to the set of devices in the SDN via the control planethat is isolated from the packet forwarding path comprises sending theset of instructions as the control message to the subset of devices viathe control plane that is isolated from the packet forwarding path.
 9. Anon-transitory computer-readable medium that includes computer-readableinstructions stored thereon that are executable by a processor toperform or control performance of operations comprising: identify a setof devices in a software-defined network (SDN); determine a set ofcharacteristics that the set of devices in the SDN are to monitor withinthe SDN; generate a set of instructions for the set of devices in theSDN to monitor the set of characteristics; send the set of instructionsas a control message to the set of devices in the SDN via a controlplane that is isolated from a packet forwarding path; receive monitordata via the control plane from at least one device of the set ofdevices in the SDN, the monitor data being based on the at least onedevice of the set of devices in the SDN monitoring of the set ofcharacteristics substantially in real-time; determine a change to a setof parameters of the SDN; generate a policy, based on the change to theset of parameters of the SDN; and send the policy to the set of devicesin the SDN, wherein an execution of the policy at one or more of the setof devices in the SDN adjusts the monitor data to more closely match atemplate.
 10. The non-transitory computer-readable medium of claim 9,wherein at least one device of the set of devices in the SDN is avirtual device.
 11. The non-transitory computer-readable medium of claim9, wherein the operation to determine the set of characteristics thatthe set of devices in the SDN are to monitor within the SDN comprises:determine a first set of characteristics for a first device type,wherein sending the set of instructions as the control message to theset of devices in the SDN via the control plane that is isolated fromthe packet forwarding path comprises sending the first set ofcharacteristics to one or more devices of the first device type; anddetermine a second set of characteristics for a second device type,wherein sending the set of instructions as the control message to theset of devices in the SDN via the control plane that is isolated fromthe packet forwarding path comprises sending the second set ofcharacteristics to one or more devices of the second device type. 12.The non-transitory computer-readable medium of claim 9, wherein theoperation to determine the change to the set of parameters of the SDNcomprises comparing the monitor data with the template and determiningat least one difference between the monitor data and the template,wherein the change to the set of parameters of the SDN is determined toadjust the monitor data to more closely match the template.
 13. Thenon-transitory computer-readable medium of claim 9, wherein theoperation to determine the set of characteristics that the set ofdevices in the SDN are to monitor within the SDN comprises selecting asubset of devices of the set of devices in the SDN.
 14. Thenon-transitory computer-readable medium of claim 13, wherein theoperation to generate the set of instructions for the set of devices inthe SDN to monitor the set of characteristics comprises generating theset of instructions for the subset of devices, wherein the operation tosend the set of instructions as the control message to the set ofdevices in the SDN via the control plane that is isolated from thepacket forwarding path comprises sending the set of instructions as thecontrol message to the subset of devices via the control plane that isisolated from the packet forwarding path.
 15. A system comprising: amemory; and one or more processors, the one or more processors areconfigured to perform operations comprising: identify a set of devicesin a software-defined network (SDN); determine a set of characteristicsthat the set of devices in the SDN are to monitor within the SDN;generate a set of instructions for the set of devices in the SDN tomonitor the set of characteristics; send the set of instructions as acontrol message to the set of devices in the SDN via a control planethat is isolated from a packet forwarding path; receive monitor data viathe control plane from at least one device of the set of devices in theSDN, the monitor data being based on the at least one device of the setof devices in the SDN monitoring of the set of characteristicssubstantially in real-time; determine a change to a set of parameters ofthe SDN; generate a policy, based on the change to the set of parametersof the SDN; and send the policy to the set of devices in the SDN,wherein an execution of the policy at one or more of the set of devicesin the SDN adjusts the monitor data to more closely match a template.16. The system of claim 15, wherein at least one device of the set ofdevices in the SDN is a virtual device.
 17. The system of claim 15,wherein when determining the set of characteristics that the set ofdevices in the SDN are to monitor within the SDN, the one or moreprocessors are configured to perform operations comprising: determine afirst set of characteristics for a first device type, wherein sendingthe set of instructions as the control message to the set of devices inthe SDN via the control plane that is isolated from the packetforwarding path comprises sending the first set of characteristics toone or more devices of the first device type; and determine a second setof characteristics for a second device type, wherein sending the set ofinstructions as the control message to the set of devices in the SDN viathe control plane that is isolated from the packet forwarding pathcomprises sending the second set of characteristics to one or moredevices of the second device type.
 18. The system of claim 15, whereinwhen determining the change to the set of parameters of the SDN, the oneor more processors are configured to perform operations comprisingcomparing the monitor data with the template and determining at leastone difference between the monitor data and the template, wherein thechange to the set of parameters of the SDN is determined to adjust themonitor data to more closely match the template.
 19. The system of claim15, wherein when determining the set of characteristics that the set ofdevices in the SDN are to monitor within the SDN, the one or moreprocessors are configured to perform operations comprising select asubset of devices of the set of devices in the SDN.
 20. The system ofclaim 19, wherein when generating the set of instructions for the set ofdevices in the SDN to monitor the set of characteristics, the one ormore processors are configured to perform operations comprisinggenerating the set of instructions for the subset of devices, whereinwhen sending the set of instructions as the control message to the setof devices in the SDN via the control plane that is isolated from thepacket forwarding path, the one or more processors are configured toperform operations comprising sending the set of instructions as thecontrol message to the subset of devices via the control plane that isisolated from the packet forwarding path.